Writing spirals based on servo tracks of a different sample rate

The present disclosure includes systems and techniques relating to self-servo-writing. In some implementations, a method includes determining a spiral velocity associated with writing a plurality of reference spiral sets; identifying a plurality of launching tracks based on a predetermined ratio and the spiral velocity, where each of the plurality of launching tracks is associated with one of the plurality of reference spiral sets; writing each of the plurality of reference spiral sets starting at its associated launching track; and writing one or more sets of servo wedges using the plurality of reference spiral sets, where the reference spiral sets and the one or more sets of servo wedges are written at the predetermined ratio.